Death Game in another world

Because life was unfair toward him, whether at home or at school, everyone thought of him as a loser and his only way of escape was a virtual game. A world that never judged him, a place he felt safe, his paradise but then it happened. During a dungeon raid against the Boss with his teammates, they team betrayed him. They left him for dead and when he thought his character would respawn as usual. The game had other plans for him. His soul is trapped inside the world; there's no respawning or second chance. His only way out is to finish the game and claim the Holy Grail, an artifact that grants a single wish. “Win, and you can return to your own world” “Lose, and you die for good.” What he didn't know was that this world held many surprises for him. The Death Game in Another World has just begun... — Description from novelcodex.org